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注水吞吐是提高小断块采收率的一项重要技术,其原理是:在一个油层具有亲水性的密闭油藏单元内,利用油层的亲水性,发挥毛细管力吸水排油的作用,将原油从低渗孔道排到高渗孔道,而注入水部分进入并驻留在低渗孔道,使油层内油水饱和度重新分布,同时恢复地层压力。如果油层含气饱和度较高,随注入水的增加,油藏压力上升,当油藏压力高于饱和压力时,油层中的游离气将重新溶解,储存一定的弹性驱油能量。
Water flooding is an important technology to improve the recovery of small fault blocks. The principle is that in a closed reservoir unit with hydrophilic layer, the hydrophilicity of the reservoir layer is utilized to exert the capillary force to absorb water and drain the oil. Crude oil is discharged from the low-permeability tunnel to the high-permeability tunnel, while the injected water enters and resides in the low-permeability tunnel, redistributing the oil-water saturation in the reservoir and restoring the formation pressure. If the reservoir gas saturation is high, the reservoir pressure rises with the increase of injected water. When the reservoir pressure is higher than the saturation pressure, the free gas in the reservoir will be redissolved and a certain amount of elastic displacement energy will be stored.